ELF-18D656J Common Mode Choke Equivalent & Substitute Parts

Part Overview

The ELF-18D656J is a 2-line common mode choke manufactured by Panasonic Electronic Components, designed for through-hole mounting applications requiring 1.6A current handling capability. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing design support and production continuity. The part features a typical DC resistance of 225mOhm and is packaged in a vertical 4-pin configuration with dimensions of 21.00mm × 29.00mm × 34.60mm (height).

Substiute Parts

ELF-18D656J

Panasonic Electronic ComponentsIn Stock: 749ELF-18D656J Datasheet

Current PartRFQ

B82734R2172B030

EPCOS - TDK ElectronicsIn Stock: 9215B82734R2172B030 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ELF-18D656J is determined by the following critical parameters:

• Functional Type: 2-line common mode choke for power line filtering
• Current Rating: Minimum 1.6A; substitute must support equal or greater current capacity
• Mounting Configuration: Through-hole vertical 4-pin package required for PCB compatibility
• DC Resistance: Typical value 225mOhm; substitute performance within acceptable range for the application
• Physical Envelope: Dimensions must accommodate existing PCB layout constraints

The substitute part B82734R2172B030 meets these criteria with a current rating of 1.7A (exceeds requirement), DC resistance of 320mOhm (within acceptable tolerance for common mode choke applications), and identical through-hole vertical 4-pin packaging.

Parameter Comparison

Engineering Selection Recommendations

The B82734R2172B030 serves as a direct functional substitute for the ELF-18D656J based on the following engineering criteria:

Current Capacity: The substitute provides 1.7A rating, which exceeds the original part's 1.6A requirement, ensuring adequate headroom for the application.

Electrical Performance: DC resistance of 320mOhm compared to 225mOhm represents a 42% increase. This difference is within acceptable tolerance for common mode choke applications where exact inductance matching is not critical to circuit function.

Compliance Status: The substitute is ROHS3 compliant and carries certifications from ENEC, UR, and VDE, providing regulatory advantages over the non-compliant original part. The substitute is currently in active production status, ensuring long-term availability.

Physical Compatibility: While the substitute has a slightly larger length dimension (32.50mm vs. 21.00mm), the height is reduced (31.00mm vs. 34.60mm). PCB layout verification is required to confirm fit within the existing design envelope.

Environmental Specifications: The substitute provides defined operating temperature range (-40°C ~ 125°C) and AC voltage rating (250V), offering better specification documentation than the original part.

Frequently Asked Questions (FAQ)

Q: Can B82734R2172B030 directly replace ELF-18D656J without circuit modification?

A: The substitute is functionally compatible as a 2-line common mode choke with superior current rating and compliance status. However, the increased DC resistance (320mOhm vs. 225mOhm) may affect circuit performance in applications sensitive to insertion loss. Circuit validation is required for critical applications.

Q: What is the impact of the dimensional difference between the two parts?

A: The substitute is 11.5mm longer (32.50mm vs. 21.00mm) but 3.6mm shorter in height. PCB layout must be verified to confirm the part fits within the available space. Pin spacing and mounting hole alignment remain compatible due to identical 4-pin vertical package configuration.

Q: Why is the substitute's DC resistance higher?

A: DC resistance variation is inherent to different manufacturing processes and core materials used by different manufacturers. For common mode choke applications, this 42% increase falls within acceptable engineering tolerance and does not prevent functional substitution.

Q: Is the substitute suitable for new designs?

A: Yes. The B82734R2172B030 is in active production status with current RoHS3 compliance and international certifications (ENEC, UR, VDE), making it suitable for both legacy replacement and new design applications.

Q: What are the packaging differences?

A: The original part is supplied in standard packaging, while the substitute is supplied in trays. This affects handling and storage procedures but does not impact electrical or mechanical compatibility.